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The inhomogeneity of grid turbulence

Published online by Cambridge University Press:  28 March 2006

H. L. Grant  and
I. C. T. Nisbet
H. L. Grant
Affiliation:
Cavendish Laboratory, University of Cambridge
I. C. T. Nisbet
Affiliation:
Cavendish Laboratory, University of Cambridge
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Abstract

The intensity of turbulent motion in the wake of square mesh grids of bars has been examined experimentally. The measurements show that there are considerable departures from homogeneity over surfaces normal to the mean stream. Large variations of intensity have been observed at a distance of 80 meshlengths from the grid, where they are diminishing slowly, if at all. This inhomogeneity is believed to be the cause of the discrepancies between various sets of measurements of energy decay in the ‘initial period’. There is also a possibility of error in other measurements made in grid turbulence and analysed on the assumption of homogeneity. Observations with a grid of 2 in. mesh show that v2 is significantly less than u2, which is consistent with results from other laboratories.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 2 , Issue 3 , May 1957 , pp. 263 - 272
Copyright
© 1957 Cambridge University Press

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References

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